21411-53-0 8,9,14,15,24,25-Hexahydro-14-hydroxy-3-isopropyl-4,12-dimethyl-3H-21,18-nitrilo-1H,22H-pyrrolo(2,1-c)(1,8,4,19)dioxadiazacyclotetracosine-1,7,16,22(4H,17H)-tetrone 8,9,14,15,24,25-Hexahydro-14-hydroxy-4,12-dimethyl-3-(1-methylethyl)-3H-21,18-nitrilo-1H,22H-pyrrolo(2,1-c)(1,8,4,19)dioxadiazacyclotetracosine-1,7,16,22(4H,17H)-tetrone EINECS 244-376-6 NSC 244426 NSC 87432 Ostreogrycin a VERNAMYCIN A Virginiamycin Factor M1 Virginiamycin M1 Virginiamycin factor m(sub 1)